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%D \module
%D [ file=spac-fil,
%D version=2013.01.13,
%D title=\CONTEXT\ Spacing Macros,
%D subtitle=Fillers,
%D author={Hans Hagen and Wolfgang Schuster},
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Spacing Macros / Fillers}
\unprotect
%D A bit more extensive variant of a prototype posted by Wolfgang to the
%D development list. Instead of dealing with a few leader types it makes
%D sense to support them all as well as simple rule fillers. Eventually we
%D can also use in for the mathfillers. We distinguish between alternatives
%D and with them methods, and a checker is provided for use in applying
%D e.g.\ fillers in lists.
\installcorenamespace{filler}
\installcorenamespace{filleralternative}
\installcorenamespace{fillerleadermethod}
\installcommandhandler \??filler {filler} \??filler
\let\setupfillers\setupfiller
\unexpanded\def\filler
{\dosingleempty\spac_fillers_indeed}
\unexpanded\def\checkedfiller#1%
{\ifcsname\namedfillerhash{#1}\s!parent\endcsname
\spac_fillers_indeed[#1]%
\expandafter\gobbleoneargument
\else
\expandafter\firstofoneargument
\fi{#1}}
\def\spac_fillers_indeed[#1]%
{\removeunwantedspaces
\begingroup
\edef\currentfiller{#1}%
\usefillerstyleandcolor\c!style\c!color
\scratchdimen\fillerparameter\c!leftmargin\relax
\ifdim\scratchdimen=\zeropoint\else
\hskip\scratchdimen
\fi
\fillerparameter\c!left\relax
\expandnamespaceparameter\??filleralternative\fillerparameter\c!alternative\s!unknown\relax
\fillerparameter\c!right\relax
\scratchdimen\fillerparameter\c!rightmargin\relax
\ifdim\scratchdimen=\zeropoint\else
\hskip\scratchdimen
\fi
\endgroup
\ignorespaces}
\setvalue{\??filleralternative\s!unknown}%
{}
\setvalue{\??filleralternative\v!symbol}%
{\expandnamespaceparameter\??fillerleadermethod\fillerparameter\c!method\v!local
\ifdim\fillerparameter\c!offset>\zeropoint
\simplealignedspreadbox
{2\dimexpr\fillerparameter\c!offset\relax}%
{\fillerparameter\c!align}%
{\fillerparameter\c!symbol}%
\else
\simplealignedbox
{\fillerparameter\c!width}%
{\fillerparameter\c!align}%
{\fillerparameter\c!symbol}%
\fi
\hfill}
\setvalue{\??filleralternative\v!stretch}%
{\hfill}
\setvalue{\??filleralternative\v!space}%
{\hskip\fillerparameter\c!distance\relax}
\setvalue{\??filleralternative\v!rule}%
{\expandnamespaceparameter\??fillerleadermethod\fillerparameter\c!method\v!local
\hrule
\!!height\fillerparameter\c!height
\!!depth \fillerparameter\c!depth
\hfill}
\letvalue{\??fillerleadermethod\s!local }\normalleaders % overflow ends up inbetween (current box)
\letvalue{\??fillerleadermethod\v!global}\normalgleaders % overflow ends up inbetween (outermost box)
\letvalue{\??fillerleadermethod\v!middle}\normalcleaders % overflow ends up before, after (current box)
\letvalue{\??fillerleadermethod\v!broad }\normalxleaders % overflow ends up before, inbetween, after (current box)
\setupfillers
[\c!width=\emwidth,
\c!symbol=.,
\c!distance=\emwidth,
\c!offset=\zeropoint,
\c!align=\v!middle,
\c!height=.1\exheight,
\c!depth=\zeropoint,
\c!leftmargin=\zeropoint,
\c!rightmargin=\zeropoint,
\c!alternative=\v!symbol,
\c!method=\s!local]
\definefiller
[\v!sym]
[\c!method=\v!global,
\c!width=.5\emwidth,
\c!leftmargin=.5\emwidth,
\c!rightmargin=.5\emwidth]
\definefiller
[\v!symbol]
[\c!method=\v!global,
\c!offset=.125\emwidth,
\c!leftmargin=.5\emwidth,
\c!rightmargin=.5\emwidth]
\definefiller
[\v!rule]
[\c!alternative=\v!rule,
\c!leftmargin=.5\emwidth,
\c!rightmargin=.5\emwidth]
\definefiller
[\v!width]
[\c!alternative=\v!stretch]
\definefiller
[\v!space]
[\c!alternative=\v!space,
\c!distance=3\emwidth]
% maybe box -> symbol
\protect \endinput
% \definefiller[test-a][alternative=stretch]
% \definefiller[test-b][alternative=symbol,symbol=!]
% \definefiller[test-c][alternative=rule,height=.1ex,leftmargin=.5em,rightmargin=.25em]
% \starttext
% text\filler[test-a]text \par
% text\filler[test-b]text \par
% text\filler[test-c]text \par
% text\checkedfiller{<nothing>}text \par
% \stoptext
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